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Implement a generic length parameter for Vec<T, N> #879

Job	Run time
test	29s
check (x86_64-unknown-linux-gnu)	16s
clippy	12s
doc (x86_64-unknown-linux-gnu)	20s
check (i686-unknown-linux-musl)	18s
check (riscv32imc-unknown-none-elf)	18s
doc (thumbv7m-none-eabi)	24s
check (armv7r-none-eabi)	21s
style	12s
check (thumbv6m-none-eabi)	17s
check (thumbv7m-none-eabi)	41s
testcfail	19s
check (thumbv8m.base-none-eabi)	19s
testcpass (x86_64-unknown-linux-gnu)	11s
check (thumbv8m.main-none-eabi)	16s
testmiri	1m 16s
testcpass (x86_64-unknown-linux-gnu, --release)	15s
testcpass (i686-unknown-linux-musl)	16s
testcpass (i686-unknown-linux-musl, --release)	12s
testtsan (x86_64-unknown-linux-gnu)	32s
testtsan (x86_64-unknown-linux-gnu, --release)	39s
	8m 3s

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